Oil pump casing and mounting for internal combustion engines



June 7, 1960 A. E. KOLBE 2,939,547

OIL PUMP CASING AND MOUNTING FOR INTERNAL COMBUSTION ENGINES Original Filed Oct. 1, 1954 i p Z2 I I ,2? a; if INVENTOR.

Adelbert E. Kolbe, Berkley, Mich, assignor to General Motors Corporation, Detroit, Mich., a corporation of Delaware Original application Oct. 1, 1954, Ser. No. 459,668. aigidgg and this application Apr. 16, 1958, Ser. No.

2 Claims. (Cl. 1 84-6) This application is a division of SN. 459,668, filed in the names of Eugene B. Etchells, Adelbert E. Kolbe and Harry F. Barr, October 1, 1954.

The invention relates to lubricating systems for internal combustion engines and has particular relation to a lubricating oil pump casing and mounting especially applicable for use in V-type internal combustion engines and elsewhere.

It is proposed to improve the lubricating system and to simplify the construction and service of an internal combustion engine by changing the construction of the oil pump so that the structure is more easily manufactured, assembled and serviced. It is proposed to secure the pump to the engine frame by the employment of a single bolt having the tensile strength required to support the oil pump on the frame and then prevent relative movement of the oil pump with respect to the frame by em ploying means to prevent rotation of one element with respect to the other about the axis of the bolt. It is also proposed to provide a simplified arrangement of passages in the pump casing and the engine frame and extending through the supporting surfaces between the pump and the engine frame.

In the drawing:

'Figure l is a fragmentary cross sectional view of the lower part of a V-type internal combustion engine for automotive and other purposes and showing particularly the mounting of a lubricating oil pump on a part of the engine frame particularly a bearing cap part of the engine frame employed in supportingthe crankshaft of the engine within the engine frame.

Figure 2 is an enlarged fragmentary cross sectional view of the structure disclosed by Figure l and particularly illustrating the discharge passages formed in-the pump casing and theengine frame and the principal fastening means by which the pump casing is secured to the engine frame. 7 r

Figure3 is an enlarged fragmentary longitudinal-sectional view of the structure disclosed by the preceding figures and particularly illustrating the dowel pin means employed in securing the pump casing against rotation upon the engine frame.

The engine 10 embodies banks of cylinders ll havi'ng reciprocating pistons 12 mounted therein and secured by connecting rods 13 to the crankshaft 14 of the engine 10. The frame 16 of the engine 10 is formed to provide bearings 17 having bearing caps '18 secured by bolts 19, the crankshaft being removable by removing the. bolts 19 and the bearing caps 18. A projection 21 may be formed on one of the bearing caps or elsewhere on the frame 16, the projection being formed to terminatae at lower extremity thereof in a plane surface indicated by the numeral 22. A lubricating o-il'pump 23 for the engine 10 may have a casing 24 having a boss 26 extending there from and on which plane surface 27 is also formed. It is proposed to secure the pump casing 24 to the projection 21 by employing a bolt 29, the tensile strength of great ice A which is sufficient to support the pump 23 upon the frame 16 of the .engine:10.'-.-'Ihe: bolt 29'may extend through aligned openings formed inthe centralpartsof the boss 26 and the projection 21, the bolt being-threaded intoa threaded opening formed in'the projection 21, the head of the bolt extending below and engaging a shoulder formed on the boss 26 and around the aligned opening within the boss 26. It will be apparent that when the bolt 29 is tightened the casing 24 will be secured to the frame 16 upon the plane surfaces 22 and 27. However, unless the bolt is tightened beyond what may be necessary to support the pump casing 24 the casing may rotate upon the projection 21, the casing 24 turning about the axis of the bolt 29 upon the surfaces 22 and 27. It is proposed to employ means to prevent such rotation and to,

make it unnecessary to tighten the bolt excessively. Such means may embody a dowel pin 31 which may slidably engage aligned openings formed in the projection 21 and the boss 26 and extending through the plane surfaces 22 and 27. Lublicating oil is discharged from the pump 23 through a discharge passage 32 in the casing 24 and into a cavity 33 formed in one of the plane surfaces 22 or 27. From the cavity 33, the lubricating oil may be supplied to the engine through passages 34 and 36 formed in any suitable manner in the frame 16. -It is proposed to have the bolt 29 extend through the cavity 33 so that the sealing surface between the projection 21 and the boss 26 will not be affected by being intersectedaby the aligned openings in which the bolt 29 is secured.

It will be apparent that the pump 23 can be removed from the engine frame 16 merely by removing the bolt 29. The pin 31 may be made more tightly to engage one of the openings into which it projects than the other, so that the pin will remain either in the projection 21 or the boss 26, when the pump 23 is removed.

It will be noted that the cavity 33 is sealed around the plane surfaces on the projection 21 and the boss 26 and around the bolt 29 when the bolt 29 is secured in the openings in the projections and the boss.

Iclaim:

1. A lubricating system for an internal combustion engine having a crankshaft and a bearing and comprising a bearing cap forming a part of said bearing and removably secured thereto, said bearing cap being formed to provide a projection having an end formed to provide a plane surface, an oil pump having a casing formed to provide an enlarged boss disposed in opposed relation to said projection and having a plane surface engaging said plane surface on said projection, a bolt having the tensile strength required to support said oil pump on said bearing cap and extending through said plane surfaces and, through aligned openings formed in the central parts of said boss and said projection, and a pin disposed radially outwardly from said bolt and in parallel relation thereto and tightly fitting aligned openings formed in said boss and said projection and preventing rotational movement of said pump with respect to said bearing cap and upon said bolt and said plane surfaces, one of said plane municate on opposite sides of said bolt with oil passages formed in said bearing cap and said pump casing.

2.-A lubricating system for internal combustion engines and comprising an engine frame formed to provide a projection having a plane surface thereon, an oil pump having a casing formed to provide a boss disposed in op-' posed relation to said projection and having a plane surface thereon engaging said plane surface on said projec tion, a boltghaving the tensile strength required to supporfl-said'oiL pumpi on said frame and extending through saidplane surfaces and through aligned openings formed in the central parts of said boss and said projection, one of said plane surfaces having a cavity positioned to intersect=said aligned lopenings for said-bolt and providing Communication aroundtsaid bolt With oil; p'assages' formed in said frame and said pump easing, and means for preventing rotational movement of said pump with respect to saidprojectand upon said boltand said plane surfaces.

UNITED STATES PATENTS Coatalen Jan. 15, 1918 Brown et al. Mar. 24, 1925 Trautner Dec. 15, 1925' Jacoby May 23, 1933 IKishline Oct. 31,1939 

